The latest gee-whiz project from Amazon is the Scout robot, a cooler-sized automated delivery device that rolls along sidewalks to transport shipments to your home. Amazon's planes, drones, delivery trucks and relationship with the U.S. Postal Service apparently are not all-inclusive enough to handle the online retailing giant's logistical challenges. Enter Scout, an electric-powered delivery robot. Amazon has begun testing six of the cooler-sized, six-wheeled robots in a neighborhood in Snohomish County, Washington, about 60 miles northeast of Amazon's Seattle headquarters. Initially, the Scout robots will operate Monday through Friday during the daytime.